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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: CollectionField.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.core;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.reflect.TypeToken;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Collection;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Collections;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.Iterator;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.List;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.SortedSet;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * Superclass of fields with types assignable to {@link Collection}.<a name="line.19"></a>
<span class="sourceLineNo">020</span> *<a name="line.20"></a>
<span class="sourceLineNo">021</span> * @param &lt;C&gt; Java collection type<a name="line.21"></a>
<span class="sourceLineNo">022</span> * @param &lt;E&gt; Java collection element type<a name="line.22"></a>
<span class="sourceLineNo">023</span> */<a name="line.23"></a>
<span class="sourceLineNo">024</span>public abstract class CollectionField&lt;C extends Collection&lt;E&gt;, E&gt; extends ComplexField&lt;C&gt; {<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    public static final String ELEMENT_FIELD_NAME = "element";<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    final SimpleField&lt;E&gt; elementField;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    /**<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * Constructor.<a name="line.31"></a>
<span class="sourceLineNo">032</span>     *<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * @param name the name of the field<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * @param storageId field content storage ID<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * @param typeToken Java type for the field's values<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * @param schema schema version<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * @param elementField this field's element sub-field<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * @throws IllegalArgumentException if any parameter is null<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @throws IllegalArgumentException if {@code storageId} is non-positive<a name="line.39"></a>
<span class="sourceLineNo">040</span>     */<a name="line.40"></a>
<span class="sourceLineNo">041</span>    CollectionField(String name, int storageId, Schema schema, TypeToken&lt;C&gt; typeToken, SimpleField&lt;E&gt; elementField) {<a name="line.41"></a>
<span class="sourceLineNo">042</span>        super(name, storageId, schema, typeToken);<a name="line.42"></a>
<span class="sourceLineNo">043</span>        if (elementField == null)<a name="line.43"></a>
<span class="sourceLineNo">044</span>            throw new IllegalArgumentException("null elementField");<a name="line.44"></a>
<span class="sourceLineNo">045</span>        this.elementField = elementField;<a name="line.45"></a>
<span class="sourceLineNo">046</span>        assert this.elementField.parent == null;<a name="line.46"></a>
<span class="sourceLineNo">047</span>        this.elementField.parent = this;<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>// Public methods<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>    /**<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * Get the element field.<a name="line.53"></a>
<span class="sourceLineNo">054</span>     *<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * @return collection element field<a name="line.55"></a>
<span class="sourceLineNo">056</span>     */<a name="line.56"></a>
<span class="sourceLineNo">057</span>    public SimpleField&lt;E&gt; getElementField() {<a name="line.57"></a>
<span class="sourceLineNo">058</span>        return this.elementField;<a name="line.58"></a>
<span class="sourceLineNo">059</span>    }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>    @Override<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public final List&lt;SimpleField&lt;E&gt;&gt; getSubFields() {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        return Collections.&lt;SimpleField&lt;E&gt;&gt;singletonList(this.elementField);<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    @Override<a name="line.66"></a>
<span class="sourceLineNo">067</span>    public boolean hasDefaultValue(Transaction tx, ObjId id) {<a name="line.67"></a>
<span class="sourceLineNo">068</span>        return this.getValue(tx, id).isEmpty();<a name="line.68"></a>
<span class="sourceLineNo">069</span>    }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>    @Override<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public abstract C getValue(Transaction tx, ObjId id);<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>// Non-public methods<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span>    @SuppressWarnings("unchecked")<a name="line.77"></a>
<span class="sourceLineNo">078</span>    &lt;F&gt; Iterable&lt;F&gt; iterateSubField(Transaction tx, ObjId id, SimpleField&lt;F&gt; subField) {<a name="line.78"></a>
<span class="sourceLineNo">079</span>        if (subField == this.elementField)<a name="line.79"></a>
<span class="sourceLineNo">080</span>            return (Iterable&lt;F&gt;)this.getValue(tx, id);<a name="line.80"></a>
<span class="sourceLineNo">081</span>        throw new IllegalArgumentException("unknown sub-field");<a name="line.81"></a>
<span class="sourceLineNo">082</span>    }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>    @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>    abstract CollectionFieldStorageInfo&lt;C, E&gt; toStorageInfo();<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>    @Override<a name="line.87"></a>
<span class="sourceLineNo">088</span>    void unreferenceRemovedObjectTypes(Transaction tx, ObjId id, ReferenceField subField, SortedSet&lt;Integer&gt; removedStorageIds) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        assert subField == this.elementField;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        for (Iterator&lt;?&gt; i = this.getValueInternal(tx, id).iterator(); i.hasNext(); ) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>            final ObjId ref = (ObjId)i.next();<a name="line.91"></a>
<span class="sourceLineNo">092</span>            if (ref != null &amp;&amp; removedStorageIds.contains(ref.getStorageId()))<a name="line.92"></a>
<span class="sourceLineNo">093</span>                i.remove();<a name="line.93"></a>
<span class="sourceLineNo">094</span>        }<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span>}<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>




























































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